JMeter-- ThreadGroup原理分析

JMeterEngine會驅動JMeter ThreadGroup啓動Test Threads 執行測試，其自己也是一個Runnable，這裏把測試驅動（JUnit或者其餘相似main之類的）看做主線程(main thread)的話, JMeterEngine做爲第一層子線程(First Child Thread)，因此若是項目代碼基於不少模塊（好比基於OSGI），須要進行ClassLoader調整的話能夠重寫JMeterEngine的runTest方法，例如.:

public void runTest() throws JMeterEngineException  
{  
    try {  
        tcClassloader = Thread.currentThread().getContextClassLoader();  
  
        Future<?> f = DefaultExecutorService.getInstance().submit(this);  
        f.get();  
    }  
    catch (Exception err) {  
        stopTest();  
        throw new JMeterEngineException(err);  
    }  
    finally {  
          
    }  
}  
  
              @Override  
public void run()  
{  
    ClassLoader oldCl = Thread.currentThread().getContextClassLoader();  
    Thread.currentThread().setContextClassLoader(tcClassloader);  
    try {  
        super.run();  
    }  
    finally {  
        Thread.currentThread().setContextClassLoader(oldCl);  
    }  
}